This name is a synonym of Carex × gaudiniana Guthnick.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name (record 225126) with original publication details: Bot. Not. 1857: 133 1857.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:298937-1.
This name was in version 1 of The Plant List, record kew-225126, and has not been changed.